NDLI: Ferroelectricity of induced smectic C* phases

Content Provider	Royal Society of Chemistry (RSC)
Author	Sprick, A. Hoffmann, U. Becker, A. Meister, R. Stegemeyer, H.
Copyright Year	1995
Abstract	If non-chiral smectic C host phases are doped with chiral guest molecules, helically structured SC* phases are formed by symmetry breaking. If the chiral dopants bear transverse dipoles a spontaneous polarization, PS, will occur in these so-called induced SC* phases. In ‘classical’ dopants the chiral centre(s) as well as the transverse dipole(s) are situated in alkyl side groups (type I dopants). The tilt-angle, reduced polarization, PO=PS/sin θ(θ= tilt angle), in these mixtures are independent of the host with a linear dependence on the guest mole fraction, xG. As a material parameter the polarization power, δP=(∂PO/∂xG)ΔT, has been introduced and is discussed in terms of the molecular structure of the dopant. Deviations of PO(xG) from linearity can be considered by a local field correction. Novel chiral dopants bearing the chiral centre(s) and the transverse dipole(s) in a rigid core (type II dopants) exhibit a significant dependence of the magnitude, and sometimes even of the sign, of PO on the nature of the host. The different behaviours of the two dopant types are discussed by means of a microscopic model and can be understood in terms of a hard core guest-host interaction which influences the rotational distribution of the dopant molecules with respect to their long molecular axes.
Starting Page	2183
Ending Page	2193
Page Count	11
File Format	PDF
ISSN	09599428
Volume Number	5
Issue Number	12
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9950502183
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Liquid crystal Chirality Symmetry breaking Classical mechanics Stereocenter Dipole Alkane Nevus Dopant Local field
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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